Quick Q - 5" Exhaust
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From: Bloomfield Hills, MI
Originally Posted by quality1construction
They sell a aluminized MBRP System on Ebay that's 5" From the turbo back, including the downpipe all 5" they are $549.00
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From: Blairsville,Ga
Originally Posted by randomhero1172
5" Downpipe? From what i understand thats virtually impossible with the 7.3 becuase the 5" downpipe would be to large to fit. Got a link? Id like to see it
the 4" barely misses the manifold/up-pipe flange then again at the cross member
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From: Charlotte-Fairbanks-Bflo
What is the size of the exhaust where the downpipe connects? If it is 4", that is what you have is a 4" exhaust no matter what size pipe you use for the rest of the system. It can only flow as much as what the smallest opening in the system no matter what size you connect to it. A very simple experiment with water will prove to any doubters beyond anything else you may try. We tried this with header's and collector sizes back in my racing days. Learned a lifelong lesson that day.
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From: Blairsville,Ga
Originally Posted by Markadeck
What is the size of the exhaust where the downpipe connects? If it is 4", that is what you have is a 4" exhaust no matter what size pipe you use for the rest of the system. It can only flow as much as what the smallest opening in the system no matter what size you connect to it. A very simple experiment with water will prove to any doubters beyond anything else you may try. We tried this with header's and collector sizes back in my racing days. Learned a lifelong lesson that day.
the stock down pipe reduces down to I think 2 5/8 in some places
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From: Charlotte-Fairbanks-Bflo
Originally Posted by rbaker6336
think I remember the turbo outlet is 3 1/2 and probly a mandrel bent 3 1/2 pipe would be plenty
the stock down pipe reduces down to I think 2 5/8 in some places
the stock down pipe reduces down to I think 2 5/8 in some places
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From: Grand Lake, La.
Ray, when I took my original exhaust off the turbo the down pipe steped down from the flange and the new 4" was not steped down to 3 1/2". I thought the outlet was 4" but I didn't measure it.
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From: Charlotte-Fairbanks-Bflo
Originally Posted by miller_feed
Ray, when I took my original exhaust off the turbo the down pipe steped down from the flange and the new 4" was not steped down to 3 1/2". I thought the outlet was 4" but I didn't measure it.
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From: Blairsville,Ga
Originally Posted by miller_feed
Ray, when I took my original exhaust off the turbo the down pipe steped down from the flange and the new 4" was not steped down to 3 1/2". I thought the outlet was 4" but I didn't measure it.
I do remember my 3306s had 4" turbo outlets and the were bigger
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From: Iowa
If any one is interested I just got done installing a 5" system I purchased from ShopDiesel.com. Ordered system on Thursday and recieved it the next day with UPS ground. Total cost of system was $315 shipped to my door. Very high quaity 16 guage aluminized steel. Installation was a breeze but agree it would have been nice to have 1 more set of hands to install downpipe. Was 4" downpipe. Also went with muffler replacement pipe.
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From: Charlotte-Fairbanks-Bflo
Originally Posted by strokin_it7.3
I believe it's something like 3.625 off hand.
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Why stop at the ID of the turbo outlet? How big are the exhaust valves? Or the ID of the exhaust manifold? I thought the name of the game was all about reducing exhaust flow restriction. Mufflers, cats, even turbo's themselves are restrictions. I would be interested if you have some links that explain (maybe with pictures
for me) why the down pipe diameter cancels the diameter of the rest of the exhaust system? A 5" must flow better than a 4" even with the universal 4" down pipe because there is less restriction overall. Granted, most on this board running stock or slightly better may never flow enough exhaust to gain any benefit, but I have seen plenty of posts about going to 5" exhaust once you reach 500 hp+ because 5" flows more. Is that not true? Thanks for any help.
for me) why the down pipe diameter cancels the diameter of the rest of the exhaust system? A 5" must flow better than a 4" even with the universal 4" down pipe because there is less restriction overall. Granted, most on this board running stock or slightly better may never flow enough exhaust to gain any benefit, but I have seen plenty of posts about going to 5" exhaust once you reach 500 hp+ because 5" flows more. Is that not true? Thanks for any help.